Therapeutic effect of OncdSyn virus on lung metastases. (a, b) Gross appearance of excised lungs of representative mice from PBS control and OncdSyn treated groups. (c-f) Lung tissues were stained with H&E and examined. Representative stained sections are shown for PBS (c, d) and OncdSyn (e, f) groups at 40× (c, e) and 100× (d, f) magnifications. Metastatic foci are represented by arrows (c, d).